I went down to the the library at one of the local universities and made digital copies of the interior trims pages from their four-eyed-era Detroit Body Products books. They did not have the 1983 book there at the time that I went but they did have 1982 and 1984, so they may be of use to you.
It is a large file (21 MB)...
http://foxchassis.com/files/Detroit_Body_Products.zip